/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.aispeech.task.fsm;

import lombok.extern.slf4j.Slf4j;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;

@Slf4j
public abstract class Event<T> {
    private EventType type;
    private T target;

    public Event(EventType type, T task) {
        this.type = checkNotNull(type);
        this.target = task;
    }

    public Event(T task) {
        this(EventType.Initial, task);
    }

    public static <T> T checkNotNull(T reference) {
        if (reference == null) {
            throw new NullPointerException();
        } else {
            return reference;
        }
    }

    public Event fire() {
        throw new NotImplementedException();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        } else if (obj == null || getClass() != obj.getClass()) {
            return false;
        } else {
            final Event that = (Event) obj;
            return this.type == that.type && this.target == that.target;
        }
    }

    @Override
    public String toString() {
        return String.format("Event(type:%s, target:%s)", type.getName(), target);
    }

    public T getTarget() {
        return target;
    }

    public void setType(EventType type) {
        this.type = type;
    }

    public EventType eventType() {
        return type;
    }
}
